Rendering from at batch file fails on Windows
You are missing the file extension. The full name of the file is "layout_A.blend". So your command should be:

cd "C:\Program Files\Blender Foundation\Blender\blender.exe"
blender -b "C:\Users\Andy\Documents\Buildings\Malvern\Sienna\Pavilion\8x8\layout_A.blend" -a